package org.smart4j.chapter2.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Properties;


/**
 * 属性文件工具类
 */
public final class PropsUtil {

    private static final Logger LOGGER=  LoggerFactory.getLogger(PropsUtil.class);
//    加载属性文件
    public static Properties loadProps(String fileName) {
        Properties props = null;
        InputStream is = null;
        try {
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if (is == null) {
                throw new FileNotFoundException(fileName + " file is not found");
            }
            props = new Properties();
            props.load(is);
        } catch (Exception e) {
            LOGGER.error("load properties file failure", e);
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (Exception e) {
                    LOGGER.error("close input stream failure", e);
                }
            }
        }
        return props;
    }

//    获取字符串属性（默认值为空字符串）
    public static String getString(Properties props, String key){
        return getString(props, key,"");
    }

//    获取字符串属性（可指定默认值）
    public static String getString(Properties props,String key,String defaultValue){
        String value=defaultValue;
        if(props.containsKey((key))){
            value=props.getProperty(key);
        }
        return value;
    }

//    获取数值型属性（默认值为0）
    public static int getInt(Properties props,String key){
        return getInt(props,key,0);
    }

//       获取数值型属性（可指定默认值）
    public static int getInt(Properties props,String key,int defaultValue){
        int value = defaultValue;
        if(props.containsKey(key)){
            value=CastUtil.castInt(props.getProperty(key));
        }
        return value;
    }

//    获取布尔型属性（默认值为false）
    public static boolean getBoolean(Properties props,String key){
        return getBoolean(props,key,false);
    }

//    获取布尔型属性（可指定默认值）
    public static boolean getBoolean(Properties props,String key,Boolean defaultValue){
        boolean value=defaultValue;
        if(props.containsKey(key)){
            value=CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }
}
